Apparatus for producing ribbed or corrugated tubes.



No. 629,245. Patented My I8, I899.

, S. FRANK.

APPARATUS FOR PRODUCING RIBBEO 0R CORRUGATED TUBES.

:Applica'ti on filod July 21, was. 7 (Nu mam 5 Sheets-Sheet I,

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No. s29',245. Patented July I8, I899.

' s. FRANK.

APPARATUS FOR PRBDUGINB RIBBED 0R CORRUGATED TUBES.

(Am'alieafion filed July 21, 1898.) (No Modal.) v 5 Shams-Sheet 2.

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' Patented July la, I899.

8. FRANK. APPARATUS FOR PRODUCING BIBBED OB CORRUGATED TUBES.

:Application filed July 2!, 1898.)

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' Patented July l8, I899.

S. FRANK. APPARATUS FOR PBDDUGING BIBBED 0R CORRUGATED TUBES.

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Ni1. 629,245. Patentedluly l8, I899.

s. FRANK.- APPARATUS run PRODUCING mean on comwsnan TUBES.-

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of ribs or corrugations.

UNIT STATES PATENT OFFICE.

SALOMON FRANK, or FRANKFORT-ON-THE-MAIN, GERMANY.

APPARATUS FOR PRODUCING RIBBED OR CORRUGATED TUBES.

SPECIFICATION forming part of Letters Patent No. 629,245, dated July 18, 1899.

Application filed July 21, 1398. Serial No. 686,504. on model.)

To an whom it may concern:

Be it known that L'SALOMON FRANK, asubject of the Queen of England, and a resident of Frankfort-ou-the Main, Germany, have in v extending over the whole or part of the tube.v

In the accompanying drawings, Figures 1 we are longitudinal and transverse sections of variouslycorrugated tubes made in 'ac-.

cordance with my invention. Fig. 5 isfan exterior view of a modification. Fig. 6 'is a plan view of a cycle handle-bar with corrugated end portions or grips. Fig. 7 is a'1ongitudiual section of a tube with another form Figs. 8 and S are vertical central sections'of the improved apparatus used in corrugating the tubes, and Fig. 8 is a horizontal section thereof. Figs. 9 and 9 are vertical central sections of, a different form of the apparatus, and Fig. 9 is ahorizontal section thereof. Figs. 10 and 10 are vertical central sections of another form of the apparatus, and Fig. 10 is a horizontal section thereof. Fig. 11 is a cross-section of another form of corrugated tube. Fig. ll is a plan view of the apparatus used in makingthe'latter tube. Fig. 11 is a plan view of the mandrel of Fig. 11, and Fig. 11 is a detail thereof.

According to this invention the tube to be ribbed or corrugated is forced along between a matrix and a mandrel, in'which balls are arranged at each side of the tube to produce the desired shape, as hereinafter described.

In cases where the tubes are to be longitudinally ribbed throughout their length, as represented in longitudinal and transverse sections in Fig. 1, the device shown in Figs.

9*, 9 and 9 is employed. This device consists of an exterior matrix aand an interior mandrel b. In the matrix a two circular superposed rows or annular series of balls 0 c are arranged. Behind these ballsscrews e are provided, by means of which the balls the balls (1 d in the matrixare situated in the same horizontal planes as the balls 0 c in the mandrel; but the balls in the matrix are situated opposite the spaces between the balls in the mandrel, as shown'iu Fig. 9.

series 0' of the balls in the matrix slightly farther toward the center than the other series of balls c. (The mandrel b is so shaped thatthe balls at and 61 will project according to the inner diameter of the tubes. If, now,

the tube A be forced along between the matrix and the mandrel, the balls c c" of the matrix will ,press the metal of the tube inward, during which. operation the balls d d The balls .c of the matrix and the balls at of the manof themandrel act as abutments.

drel serve as the preliminary and the balls 0 d as the finishing balls. I

For producing ribs which do 'not extend throughout the length of the tube, as illustrated in Fig. 2, the device shown in Figs. 8 8", and S is employed. In this device the matrix ct and the mandrel I) are each furnished with only one annular series or row of balls 0 and d, respectively. In commencing the operation the screws e of the matrix are so adjusted that the balls c allow the tube to be inserted, so that the part where the ribs or 'corruga-' tionsare to be. commenced'is between the series of balls 0 in the matrix and the balls at in the mandrel, Fig. 8 The screws 6 are then so turned that the balls 0 pressinward the wall of the tube, thus producing inwardlyprojecting bulges thereon. Thereupon the tube A is drawn along between the matrix and the mandrel to an extent corresponding to the length of the ribs to be made on the said tube, and finally the screws care turned outward to admit of the tube being withdrawn. If the balls (1 in the mandrel are required to bulge the wall of the tube outward,

The screws e are turned so as to force one so that'tubes with outwardly-projecting ribs or corrugations are formed, as shown in Fig.

3, the device shown in Figs. 10, 10 and 10 is employed. In this device the matrix a can be like that last described; but the mandrel b is surrounded bya hollow sleeve or cylinderb, having openings therein through which the balls cl project, and the mandrel b proper has a conical or tapered part 19 The screws e are so adjusted that the balls 0 allow tube A to be inserted between the balls 0 and d. The mandrel b proper is concentrically inserted into the tube A and so connected with it as to be compelled to participate in the movement thereof along the matrix. W' hen the tube has been inserted to requisite extent, the conical portion 19 of the mandrel comes into contact with the balls (1 in the sleeve and forces these balls outward, so that outwardlyprojecting ribs are formed upon the tube A. The balls 0 of the matrix in this case serve as abutments.

Zigzag ribs or corrugations, as represented in Fig. 5, can be formed by turning the tube axially to and fro while it is being moved longitudinally in the matrix.

Spiral or helical ribs or corrugations can be formed if the tube receives a rotary movement in one direction while it is being moved longitudinally in the matrix.

By properly shaping the mandrel 1) nonoontinuous ribs may be formed on the tube, as shown in Fig. 7.

Tubes made with ribs or corrugations extending only partly throughout their length, as illustrated in Figs. 2 and 3 of the drawings, are especially suitable for seat-pillars and handle-bars of velocipedes, as such seatpillars and handle-bars are insertedinto their correspondinglyshaped sockets, in which they are thus prevented from displacement relatively to said sockets.

The form of tubeshown by Fig. 3 is suitable to be employed in the construction of frames with the object of increasing the resistance, and for this purpose the ends may be reinforced by strengthening-sleeves A as represented in Fig. 4.

When it is desired to construct very deep grooves or corrugations in tubes, as shown, for example, in Fig. 11, the mandrelb should be shaped to correspond to the internal sectional shape of the tube to be formed, and instead of providing the matrix with balls 0, as hereinbefore described, the said matrix is provided with or substituted by Wheels or disks a, as shown in Fig. 11, of suitable shape to press inward the metal of the tube between the projections on the mandrel.

Figs. 11 and 11 are detached views of the mandrel, the projections of which carry rollers d at theirends, which bear on the interior surface of the tube.

Having now particularly described and ascertained the nature of this invention and in what manner the same is to be performed, I declare that what Iclaim is- 1'. In apparatus for the manufacture of ribbed or corrugated tubes the combination of a matrix anda mandrel between which the tubes to be ribbed or corrugated are caused to move; balls carried by the matrix and the mandrel and caused to press respectively on exterior and interior surfaces of the tube while the said tube is moving between the matrix and the mandrel substantially as and for the purpose hereinbefore described.

2. In apparatus for the production or m anufacture of ribbed orcorrugated tubes the combination of a matrix and a mandrel between which the tube to be ribbed or corrugated is caused to move; balls carried by the matrix and the mandrel bearing respectively on the exterior surface and the interior surface of the tube and screws acting on the balls carried by the matrix so as to press the metal of the tube into the spaces between the balls carried by the mandrel so as to form corrugations or ribs on the tube substantially as hereinbefore described.

3. In apparatus for the production or manufacture of ribbed or corrugated tubes the combination ofa matrix and a mandrel between which a tube to be ribbed or corrugated is caused to pass; a cylindrical sleeve or ring arranged between the mandrel and the in ternal surface of the tube, openings in the sleeve or ring and balls placed in the said openings; a conical or taper part on the mandrel for pressing the balls through the openings in the sleeve or ring so as to force the metal of the tube into the spaces between the balls carried by the mandrel substantially as and for the purpose hereinbefore described.

In testimony whereof I have signed my name to'this specification in the presence of two subscribing witnesses.

SALOMON FRANK.

WVitnesses:

FRANZ HAPLAOHER, MICHAEL VoLKE. 

